(completion--try-word-completion): Don't disable

`partial-completion' any more.  Mark the added char instead.
(completion-pcm--string->pattern): Notice chars added by
completion--try-word-completion and treat them specially.

lisp/ChangeLog

+2009-04-14  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+	* minibuffer.el (completion--try-word-completion): Don't disable
+	`partial-completion' any more.  Mark the added char instead.
+	(completion-pcm--string->pattern): Notice chars added by
+	completion--try-word-completion and treat them specially.
+
 2009-04-13  Jason Rumney  <jasonr@gnu.org>
 	* faces.el (frame-set-background-mode): Window system frames
@@ -6,13 +13,12 @@
 2009-04-13  Kenichi Handa  <handa@m17n.org>
-	* language/japanese.el (cp932): Delete alias for
-	japanese-shift-jis.
+	* language/japanese.el (cp932): Delete alias for japanese-shift-jis.
 2009-04-12  Michael Albinus  <michael.albinus@gmx.de>
-	* net/tramp.el (tramp-do-copy-or-rename-file-directly): Overwrite
-	always the tmpfile.  (Bug#2962).
+	* net/tramp.el (tramp-do-copy-or-rename-file-directly):
+	Overwrite always the tmpfile.  (Bug#2962).
 2009-04-11  Chong Yidong  <cyd@stupidchicken.com>
@@ -25,8 +31,8 @@
 	(hack-dir-local-variables): Adapt to new
 	dir-locals-directory-cache entry format.
-	* international/mule-diag.el (describe-font-internal): Change
-	ignored argument to IGNORED.
+	* international/mule-diag.el (describe-font-internal):
+	Rename ignored argument to IGNORED.
 	(describe-font): Elide unnecessary argument to
 	describe-font-internal (Bug#2945).
@@ -85,8 +91,7 @@
 2009-04-09  Michael Albinus  <michael.albinus@gmx.de>
-	* net/tramp.el (tramp-file-name-handler-alist): Add
-	`vc-registered'.
+	* net/tramp.el (tramp-file-name-handler-alist): Add `vc-registered'.
 	(tramp-handle-vc-registered ): New defun.  (Bug#1741).
 	* net/tramp-cache.el (tramp-flush-directory-property): Use the

lisp/minibuffer.el

@@ -607,13 +607,17 @@ If `minibuffer-completion-confirm' is `confirm-after-completion',
       ;; If completion finds next char not unique,
       ;; consider adding a space or a hyphen.
       (when (= (length string) (length (car comp)))
-        (let ((exts '(" " "-"))
+        ;; Mark the added char with the `completion-word' property, so it
+        ;; can be handled specially by completion styles such as
+        ;; partial-completion.
+        ;; We used to remove `partial-completion' from completion-styles
+        ;; instead, but it was too blunt, leading to situations where SPC
+        ;; was the only insertable char at point but minibuffer-complete-word
+        ;; refused inserting it.
+        (let ((exts (mapcar (lambda (str) (propertize str 'completion-try-word t))
+                            '(" " "-")))
               (before (substring string 0 point))
               (after (substring string point))
-	      ;; Disable partial-completion for this.
-	      (completion-styles
-	       (or (remove 'partial-completion completion-styles)
-		   completion-styles))
 	      tem)
 	  (while (and exts (not (consp tem)))
             (setq tem (completion-try-completion
@@ -1381,7 +1385,13 @@ or a symbol chosen among `any', `star', `point'."
           (p 0)
           (p0 0))
 
-      (while (setq p (string-match-p completion-pcm--delim-wild-regex string p))
+      (while (and (setq p (string-match-p completion-pcm--delim-wild-regex
+                                          string p))
+                  ;; If the char was added by minibuffer-complete-word, then
+                  ;; don't treat it as a delimiter, otherwise "M-x SPC"
+                  ;; ends up inserting a "-" rather than listing
+                  ;; all completions.
+                  (not (get-text-property p 'completion-try-word string)))
         (push (substring string p0 p) pattern)
         (if (eq (aref string p) ?*)
             (progn